Electric-arc lamp.



PATENTED JAN. 3, 1905.

B. A. sTows. ELECTRIC ARC LAMP.

APPLICATION FILED APR. 30, 1904.

2 SHEETS-SHEET 1v WITNESSES lNVE/VTUR A Howey PATENTBD JAN. 3, 1905.

B.- A. STOWB.

ELECTRIC ARC LAMP.

APPLIOATION FILED APR. 30, 1904.

2 BHEBTB-BHEET 2.

I/VVENTOII Q, a, 5 I Attorney glTNESSES I I UNirnn STATES Patented January 3, 1905.

PATENT rricn.

BERNARD A. STOWE, OF CLEVELAND, OHIO, ASSIGNOR TO THE JANDUS ELECTRIC COMPANY, OF CLEVELAND, OHIO.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 778,914, dated January 3, 1905. Application filed April 30, 1904:. Serial No. 205,706.

To all whom it mar concern.-

Be it known that I, BERNARD A. Srown, a resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in electric-arc lamps, and more particularly to the construction of the framework to facilitate the application thereto of the globe-holding devices, one object of the invention being to'construct the framework in such manner that the portion thereof which carries the outer globe can be readily attached to and removed from the major portion of said framework.

A further object is to so construct globeholding devices that they shall be simple in construction and easy to manipulate for quickly applying or removing the outer globe and shall operate effectually and securely sustain the globe in its normal position.

Vith these objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical cross-section, partly in elevation, of the framework of an electric-arc lamp embodying my improvements. Fig. 2 is an enlarged sectional view illustrating the globeholding devices. Figs. 3 and 1 are elevation and plan views, respectively, of the same.

The main shell or body of the lamp-casing consists of a single piece of sheet metal which is corrugated between special corrugat'ingrolls, said corrugations being confined to the intermediate portion of the sheet. The depth of the corrugations is graduated at the ends of the main corrugations so as to produce a gradual change in the diameter between the small and large diameters of the shell. The enlarged lower portion of the shell is subseqnently crimped, so as to decrease the diameter at the lower end of the edge of the shell,

which is utilized in the completed casing as a shield or screen 2 for preventing the ingress of water through the ventilating-holes 3 in a I cast-iron ring 4. The overlapping edges of the cylindrical shell are then secured by rivets or in any other suitable manner and annular grooves or corrugations 5 rolled in the enlarged upper portion of the casing for the purpose of strengthening the same. A cap or hood 6 is disposed over the upper enlarged end of the shell and provided with a peripheral flange 7, preferably curved transversely. This curved flange projects outwardly from the shell and acts as a watershed and also to preclude the entrance of dust, rain, and dirt into the casing through the ventilating-holes 8. The lower enlarged portion of the casing is provided with an annular groove 9, which engages the cast-iron ring 1. The cast-iron ring is provided with ventilating-holes 10.

The lamp is provided with a floor-plate 11, supported by a central tube 12, and the latter is secured at its upper end to the cap or hood 6 through the medium of a plate 13. The floor-plate 11 is provided with an annular raised portion or rib l4, presenting an outer inclined surface 15, which constitutes a surface of revolution of a truncated cone. The ring 4 is provided at diametrically opposite points with perforated lugs 16 and 17, and the wall of the hole in each lug 16 is threaded. Thumb-screws 18 pass through the wall of shell 1 above the ring 4: and are swiveled in the lugs 17 the threaded portions of said screws passing through the lugs 16 and the milled heads of the screws being exposed, so as to be accessible to the operator. The

plate 13 and result in forcing the shell upwardly with considerable pressure against its seat in the hood. To remove the shell, it is simply necessary to unscrew the screws 18 a sufficient distance to permit their ends to disengage the inclined surface of the rib 14 on the floor-plate.

The ring 4 is provided at diametrically opposite points with depending lugs 19, having perforations for the passage of pins 20 at respective ends of a spring-bail 21. The pins 20 normally project under a flange or bead 22 at the upper end of a supplemental shell or casing 23 and serve to support the latter in a manner to permit its ready removal. In order to insure the proper seating of the supplemental shell, the ring 4 is provided with a depending flange 24, which serves as a guide for said shell and also to prevent its displacement. A sheet-metal stamping 25 is permanently secured to the lower end of the supplemental shell 23 and constitutes a portion thereof to receive the mouth and neck of a globe 26. Blocks 27 are secured to the stamping 25, and through said nuts and the wall of the stamping thumb-screws 27 are passed, the inner ends of said screws being adapted to engage the neck of the globe, and thus attach the same to the supplemental shell. A clip 28 is secured to the supplemental shell 23 and has one end of a chain 29 secured thereto, the other end of said chain being secured to a lug 30 on the ring 4 and serves to support the supplemental shell and the globe while the lamp is being trimmed. From the ring 4, at diametrically opposite points, cams 31 depend in position to be engaged by the bail 21, and said cams are provided at or near their lower ends with pins 32, on which the bail normally rests.

When it is desired to remove the globe for the purpose of trimming the lamp, it is simply necessary for the operator to raise the bail 21, the engagement of said bail with the cams 31 acting to spread the former and cause the pins or projections 20 to move longitudinally, and thus release the supplemental shell and globe carried thereby. In replacing the supplemental shell and globe the operator will raise the bail, place thesupplemental shell in position against its seat, and then release the bail, whereupon the spring-bail riding on the cams 31 will drop to its normal position and cause the pins 20 to become disposed under the bead 22 of the supplemental shell or casing.

When access to the interior mechanism of the lamp is desired, this may be readily accomplished by first manipulating the thumbscrews to release them from the lamp-floor and then lowering the entire shell or casing, with the globe and its supporting devices.

Various slight changes might be made in the details of construction of my invention without departing from the spirit thereof or limiting its scope, and hence I do not wish to limit myself to the precise details herein set forth.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an electric-arc lamp, the combination with a main shell or casing, and a lamp-frame, of a ring removably attached to said frame and holding said shell or casing in place, a supplemental shell adapted to receive and hold a globe, and means for removably attaching said supplemental shell to said ring.

2. In an electric-arc lamp, the combination with a frame, of a main shell and a supplemental shell and means located at the lower end of the main shell for removably supporting the same, and means at the upper end of the supplemental shell for removably sup porting the same, and for permitting the re moval of the supplemental shell independently of the removal of the main shell.

3. In an electric-are lamp, the combination with the lamp-frame and a main shell, of a ring attached to the main shell, a supplemental shell having a bearing against said ring, means for removably holding the supplemental shell in place, means for attaching a globe to said supplemental shell, and means carried by said ring and engaging the lamp-frame to removably hold the main shell in place.

4. In an electric-arc lamp, the combination with a lamp-frame and a main shell, of a ring supported by the frame, a supplemental shell to bear against said ring and receive a globe, and a spring-bail pivotally attached to said ring and having pins to support the supplemental shell.

5. In an electric-arc lamp, the combination with a frame and a main shell, of a ring supported by the frame, a supplemental shell having a bearing against said ring and adapted to receive and support a globe, a springbail pivotally supported by said ring and having pins to support the supplemental shell, and cams on said ring to withdraw said pins when the bail is raised.

6. In an electric-arc lamp, the combination with a main shell or casing and a lamp-frame, of means for removably attaching said main shell or casing to the lamp-frame, a supplemental shell adapted to receive and hold a globe and means for removably attaching said supplemental shell to the main shell or casing.

7 In an arc-lamp, the combination with a lamp-frame and a main shell, of a supplemental shell and a spring-bail pivotally attached to one of said first-mentioned parts and havirlilgnprojections to support the supplemental s e 8. In an electric-arc lamp, a casing consisting of a main shell and a supplemental shell removably attached thereto by means of pins or projections and a cam for guiding the movements of said pins or projections.

9. In an electric-arc lamp, the combination With a frame, and a plate secured thereto and having an inclined portion, of a removable casing, and screws carried by said casing and adapted to engage the inclined portion of the IQ plate to support the shell.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

. BERNARD A. STOWE. Witnesses:

JOHN J. ANGEL, HENRY J. Voew 

